At the very least, people should be walking 30 minutes a day, Oz said. Once you're comfortable with that -- and have checked with your doctor -- you can add weight-bearing, flexibility and balance exercises to your routine.

Depending on your age, you also should be able to do a specific number of push-ups and sit-ups in one minute. Here is a guide:

Men between 50 and 59 years old should be able to do 15 to 19 push-ups and 20 to 24 sit-ups. Women of the same age should be able to do seven to 10 push-ups and 15 to 19 sit-ups.

Men between 60 and 69 years old should be able to do 10 to 14 push-ups and 15 to 19 sit-ups. Women of the same age should be able to do five to 10 push-ups and 10 to 14 sit-ups.

Men who are 70 to 79 years old should be able to do six to nine push-ups and 10 to 14 sit-ups, while women in that age range should be able to perform four to 10 push-ups and seven to nine sit-ups.

At 80 to 89 years old, men should be able to do three to five push-ups and six to nine sit-ups, while women of that age should be able to do two to six push-ups and four to six sit-ups.

Step Four: Manage Your Stress

Chronic stress -- such as that caused by a micro-managing boss or a troubled teen -- can put your body into long-term hyper-alert, lowering your immunity and making you susceptible to illness, Oz said.

Stress is also caused by unresolved problems, which Oz refers to as NUTS -- for Nagging, Unfinished Tasks. Identify the "Nuts" in your life so they don't become a constant source of anxiety, Oz said.

Step Five: Find Purpose

Ask yourself if there's an untapped passion you have, and figure out what obstacles stand in your way. Once you've done that, Oz advises that you try to get around those obstacles so you can pursue your passion.

Step Six: Put It All Together

The key to success is to incorporate all the steps into your daily routine, Oz said.